JP4348054B2 - Double-sided in-mold molding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a double-sided in-mold molded product having both sides subjected to transfer printing.
[0002]
[Prior art]
Conventionally, there are various methods for producing a transfer molded product that performs transfer printing at the same time as molding, and in particular, a method for producing a double-sided transfer molded product having a punching mechanism for a film is disclosed in Japanese Patent Application Laid-Open No. 62-227613. It is disclosed.
[0003]
In such a method for producing a double-sided transfer molded product, a hole is formed in a transfer film provided by positioning and supplying a film provided on the fixed mold side by a punching mechanism provided on the fixed mold side. Then, by injecting the resin through the holes, it is possible to easily obtain a transfer molded product in which transfer printing is performed on both sides of various shapes.
[0004]
[Problems to be solved by the invention]
However, the conventional method for producing a double-sided transfer molded product as described above requires that a hole be formed in the film, and cut dust generated during the punching operation remains in the cavity of the mold and enters the transparent molded product. There is a problem that the yield of the molded product is lowered because the cut dust sticks to the mold and a dent is formed on the surface of the molded product.
[0005]
Therefore, the present invention does not require a hole in the film, and manufacture of a double-sided in-mold molded product that can improve the yield of the molded product by preventing mixing of cut dust into the molded product and dent of the molded product. It aims to provide a method.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, a typical method for producing a double-sided in-mold molded product according to the present invention comprises a fixed mold having a cavity for molding a molded product and a movable mold, and prints on mutually facing surfaces. in both in-mold molding method of passing in parallel a first continuous film and the second continuous film to form a layer, the movable mold has a first curve opposed to a sprue formed in the stationary mold the fixed mold having a second curve that connected to the cavity, the fixed mold and the movable mold the second and the first curve in order from the inlet side of the sprue when the mold clamping the introduction path of the S-shaped having a curved form in the direction intersecting the film transport direction of, said second fixed mold side, so that one end of the first continuous film comes to a position opposed to the first curve To the above Causes disposed one continuous film, said second movable mold side, wherein the steps of one end of the second continuous film is disposed the second continuous film to come to a position facing the second curve, the movable a step of molding the molded product of the resin is injected between the S-shaped the said first continuous film from the introduction passage second continuous film on a combination of the mold and the fixed mold, It was characterized by having.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
[First embodiment]
An embodiment of a double-sided in-mold molding method according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a protective panel formed by the manufacturing method of the present embodiment, FIG. 2 is an explanatory view of a stage in which a continuous film is continuously passed through a fixed mold and a movable mold, and FIG. 4 is a side sectional view of the continuous film, FIG. 5 is a perspective view of the continuous film, FIGS. 6 and 7 are explanatory diagrams of a method for manufacturing a protective panel, and FIG. 8 is an introduction path and a printing pattern. FIG. 9 is an explanatory view of a fixed mold and a movable mold according to another embodiment.
[0008]
In FIG. 1, the example of the protection panels P1 and P2 manufactured by this embodiment is shown. The protective panels P1 and P2 are examples of panels for display windows of electronic devices such as mobile phones. A protective panel P1 shown in FIG. 1 (a) is a transparent acrylic plate 1a, and a frame 1b is printed around it, leaving a transparent display window 1c for displaying a liquid crystal screen at the center. Further, as shown in FIG. 1 (b), it is also possible to form a protective panel P2 having a transparent acrylic plate 2a as a whole and printed with one-points 2b of characters and patterns on a part thereof.
[0009]
Hereinafter, the manufacturing method of the protection panel P1 of the electronic device display window according to the present embodiment will be described. The present embodiment is an example of a mold apparatus that feeds two continuous films in parallel.
[0010]
As shown in FIG. 2, in the first step, the first continuous film 7 and the second continuous film 14 are continuously passed between the fixed mold 3 and the movable mold 4.
[0011]
As shown in FIG. 3A, the fixed mold 3 is formed with a sprue 3d for injecting a transparent resin from the injection port 3a, a second curve 3c, and a cavity 3b connected to the sprue 3d. The movable mold 4 has a first curve 4c and a cavity 4b. Then, as shown in FIG. 3B, when the movable mold 4 and the fixed mold 3 are clamped, the first curve 4c and the second curve 3c are used in order from the inlet 3a side of the sprue 3d. A letter-shaped introduction path Z is formed in a direction (arrow B direction: see FIG. 5) perpendicular to the film feed direction (arrow A direction: see FIG. 5). The sprue 3d and the inlet 3a are provided at positions facing the first curve 4c when the fixed mold 3 and the movable mold 4 are clamped together.
[0012]
As shown in FIG. 2, a first winding device 5 and a second winding device 6 are attached to each of the fixed mold 3 and the movable mold 4. Each of the winding devices 5 and 6 has feeding rolls 5a and 6a and winding rolls 5b and 6b, and the continuous films 7 and 14 are wound around them.
[0013]
The first continuous film 7 and the second continuous film 14 are respectively wound and held around the delivery rolls 5a and 6a, and the leading ends are passed between the fixed mold 3 and the movable mold 4 to take up the winding roll 5b, Preparation is completed by being wound around 6b. As shown in FIG. 5, the first continuous film 7 is set wider than the second continuous film 14.
[0014]
Here, as shown in FIG. 4 (a), the first continuous film 7 has a release layer 9 made of a non-adhesive material in order on a PET base film 8, and a UV for improving the surface hardness. A hard layer 10, an anchor layer 11 for improving fixing of printing, a printing layer 12, and an adhesive layer 13 are laminated. Also, as shown in FIG. 4B, the second continuous film 14 is similarly laminated on the base film 15 with the same release layer 16, UV hard layer 17, anchor layer 18, print layer 19, and adhesive layer 20. is doing.
[0015]
As shown in FIG. 5, the printed layers 12 and 19 are formed with a portion where printing is performed and a portion where printing is not performed, and a transparent resin layer is removed from the portion where printing is not performed on the back surface and the front surface. A display window (see FIG. 1) is formed. The print layers 12 and 19 are formed with a plurality of independent print patterns at predetermined intervals.
[0016]
As shown in FIG. 5, by providing a width difference between the first continuous film 7 and the second continuous film 14, the first continuous film 7 is arranged so as to face the first curve 4 c on the movable mold side. The continuous film 14 is disposed on the fixed mold side so as to face the second curve 3c. Then, the winding devices 5 and 6 are operated so that the feeding direction (arrow A direction) of the first continuous film 7 and the second continuous film 14 run side by side with the respective adhesive layers 13 and 20 facing each other. Intermittent feeding is performed between the fixed mold 3 and the movable mold 4. This intermittent feeding operation is controlled so that the printing pattern always coincides with the cavity 3 b of the fixed mold 3 and the cavity 4 b of the movable mold 4.
[0017]
Next, the resin injection process will be described with reference to FIGS. As shown in FIG. 6 (a), the print patterns of the first continuous film 7 and the second continuous film 14 are stopped at the positions of the cavities 3b and 4b as described above, and then as shown in FIG. 6 (b). The fixed mold 3 and the movable mold 4 are combined and clamped.
[0018]
As shown in FIG. 7 (a), the transparent resin is injected from the sprue 3d through the injection port 3a after the movable mold and the fixed mold are combined. The injected transparent resin proceeds on the first curve 4c, and at this time, the force of the flowing resin is not applied to the end portion 7a of the first continuous film 7 facing the first curve 4c. That is, the transparent resin injected from the injection port 3a enters the first curve 4c, and its traveling direction X is the direction toward the movable mold 4, and the end of the first continuous film 7 on the fixed mold 3 side. It flows below 7a. For this reason, the injected transparent resin does not go inside the first continuous film 7 and can surely press the first continuous film 7 toward the cavity 3b.
[0019]
As shown in FIG. 7B, the transparent resin satisfying the first curve 4c proceeds on the second curve 3c, and at this time, the end 14a of the second continuous film 14 facing the second curve 3c. Does not take the force of the flowing resin. That is, the transparent resin satisfying the first curve 4c enters the second curve 3c, and its traveling direction Y is the direction toward the fixed mold 3, and the end of the second continuous film 14 on the movable mold 4 side. Get over the part 14a. For this reason, the transparent resin satisfying the first curve 4c does not wrap around the second continuous film 14 and can reliably press the second continuous film 14 toward the cavity 4b.
[0020]
As shown in FIG. 7 (c), the transparent resin satisfying the second curve 3c presses the first continuous film 7 and the second continuous film 14 against the fixed mold and the movable mold side, while the cavity 3b, A molded product 21 filled with 4b and integrated with the first continuous film 7 and the second continuous film 14 is formed.
[0021]
Then, as shown in FIG. 7 (d), after the molded product 21 is cured, the fixed mold 3 and the movable mold 4 are opened, and the molded product is formed by the adhesive force between the sprue forming portion 21a formed on the sprue 3d. This is pushed out in a state where 21 is left on the fixed mold side, and the molded product 21 is sucked and taken out by a vacuum type take-out machine (not shown). Thereby, both the 1st continuous film 7 and the 2nd continuous film 14 are made to isolate | separate the molded article 21 and each continuous film 7 and 14 between peeling layers 9 and 16 and UV hard layers 10 and 17. FIG.
[0022]
Thereafter, the sprue forming portion 21a, which is a forming portion remaining in the sprue 3d, is cut off and the protective panel P1 is formed.
[0023]
As described above, the first continuous film 7 is passed through the fixed mold 3 side so as to face the first curve 4c, and the second side so as to face the second curve 3c on the movable mold 4 side. After passing the continuous film 14, the movable mold 4 and the fixed mold 3 are combined, and a transparent resin is injected between the first continuous film 7 and the second continuous film 14 from the S-shaped introduction path Z. By forming the molded product 21 in this way, it is possible to prevent the transparent resin from entering between the continuous film and the mold. Further, by adopting a molding method that does not perforate, cut dust generated during drilling work is prevented from being mixed into the molded product 21 and dents on the molded product 21 to improve the yield of the molded product 21. I can.
[0024]
The introduction path Z may be a path that intersects the film feeding direction (arrow A direction: see FIG. 5) and that goes out of the first continuous film 7, and is limited to the shape of the present embodiment. It is not a thing. For example, as shown in FIG. 8 (a), two print patterns are arranged in a direction crossing the film feed direction (arrow A direction) and connected from one introduction path Z to two print patterns. The branch point Za of Z may be formed outside the first continuous film 7 (common with the inlet 3a).
[0025]
Further, as shown in FIG. 8B, two print patterns are arranged in a direction crossing the film feed direction (arrow A direction) so as to be connected to the two print patterns from one introduction path Z. The branch point Za of Z may be formed in the region of the second continuous film 14.
[0026]
Further, as shown in FIG. 8 (c), two print patterns are arranged side by side so that the connecting portion Zb with the introduction path Z faces each other in the film feeding direction (arrow A direction), and the two introduction patterns Z are changed to two print patterns. It may be formed so as to be connected, and the branch point Za of the introduction path Z may be disposed in the region of the second continuous film 14 and between two printing patterns.
[0027]
[Other embodiments]
Next, another embodiment of the double-sided in-mold molding method according to the present invention will be described with reference to the drawings. FIG. 9 is an explanatory diagram of a fixed mold and a movable mold according to the present embodiment. About the part which overlaps with said 1st embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.
[0028]
In this embodiment, a fixed mold 31 and a movable mold 32 as shown in FIG. 9 are used instead of the fixed mold 3 and the movable mold 4 according to the first embodiment.
[0029]
The fixed mold 31 is formed with a sprue 31d for injecting transparent resin from an injection port 31a, a first curve 31c connected to the sprue 31d, and a cavity 31b. The movable mold 32 is formed with a second curve 32c and a cavity 32b connected to the second curve 32c. Then, as shown in FIG. 9, when the fixed mold 31 and the movable mold 32 are clamped, the first curve 31c and the second curve 32c form an S-shape in order from the inlet 31a side of the sprue 31d. The introduction path Z is formed in a direction (arrow B direction: see FIG. 5) perpendicular to the film feed direction (arrow A direction: see FIG. 5). Also, by providing a width difference between the first continuous film 33 and the second continuous film 34, the second continuous film 34 is fixed so that the first continuous film 33 faces the second curve 32c on the movable mold side. It arrange | positions so that the 1st curve 31c may be opposed to the metal mold | die side.
[0030]
Using the fixed mold 31 and the movable mold 32, the first continuous film 33 is passed through the fixed mold 31 so as to face the second curve 32c, and the first mold is formed at the movable mold 32 side. The second continuous film 34 is passed so as to face the curve 31c, and the movable mold 32 and the fixed mold 31 are combined, and then the first continuous film 33 and the second continuous film from the S-shaped introduction path Z. By injecting the transparent resin between the two and forming the molded product 21, it is possible to prevent the transparent resin from entering between the continuous film and the mold. Further, by adopting a molding method that does not perforate, cut dust generated during drilling work is prevented from being mixed into the molded product 21 and dents on the molded product 21 to improve the yield of the molded product 21. I can.
[0031]
In the present embodiment, since the second continuous film 34 is passed through the movable mold 32 side not provided with the injection port 31a, the second continuous film 34 passes through a position facing the injection port 31a. Can be made. In such a case, in particular, it is possible to more reliably prevent the transparent resin from entering between the second continuous film 34 and the movable mold 32.
[0032]
【The invention's effect】
As described above, on the fixed mold side, the first continuous film is arranged so that one end of the first continuous film is at a position facing the first curve, and on the movable mold side, the second The second continuous film is arranged so that one end of the continuous film faces the second curve, and after combining the movable mold and the fixed mold, the first continuous film from the S-shaped introduction path Resin is injected between the second continuous film to form the molded product. Thus, by a molding method without performing only hole opening, it is possible to improve the yield of molded products to prevent denting of the mixed and molded articles of the molded article cut waste.
[Brief description of the drawings]
FIG. 1 is a perspective view of a protection panel formed by a manufacturing method according to a first embodiment.
FIG. 2 is an explanatory diagram of a stage in which a continuous film is continuously passed through a fixed mold and a movable mold.
FIG. 3 is a cross-sectional view of a fixed mold and a movable mold.
FIG. 4 is a side sectional view of a continuous film.
FIG. 5 is a perspective view of a continuous film.
FIG. 6 is an explanatory diagram of a method for manufacturing a protection panel.
FIG. 7 is an explanatory diagram of a manufacturing method of a protection panel.
FIG. 8 is a diagram illustrating an arrangement of an introduction path and a print pattern.
FIG. 9 is an explanatory diagram of a fixed mold and a movable mold according to another embodiment.
[Explanation of symbols]
P1, P2 ... Protection panel Z ... Introduction path 1a ... Plate 1b ... Frame 1c ... Display window 2a ... Plate 2b ... One point 3, 31 ... Fixed mold 3a, 31a ... Inlet 3b, 4b, 31b, 32b ... Cavity 3c, 32c ... second curve 3d, 31d ... sprue 4, 32 ... movable mold 4c, 31c ... first curve 5, 6 ... winding device 5a, 6a ... roll 7, 33 ... first continuous film 7a , 14a: end 8, 15: base film 9, 16: release layer
10, 17… UV hard layer
11, 18… Anchor layer
12, 19 ... Printing layer
13, 20 ... Adhesive layer
14, 34 ... Second continuous film
21… Molded product
21a ... Sprue forming part

Claims (2)

A double-sided in-mold molding method comprising a fixed continuous mold having a cavity for molding a molded product and a movable mold, wherein a first continuous film and a second continuous film having a printed layer formed on opposite surfaces are passed in parallel. In
The movable mold has a first curve opposed to a sprue formed in the stationary mold,
The stationary mold has a second curve connected to the cavity;
The stationary mold and the movable mold in a direction intersecting the S-shaped inlet channel having the first curve and the second curve from the inlet side of the sprue in order upon clamping the film feed direction Forming,
Said second fixed mold side, said one end of the first continuous film is disposed the first continuous film to come to a position facing the first curve, similar movable mold side, said second Arranging the second continuous film so that one end of the continuous film is at a position facing the second curve;
The step of molding the molded product of the resin is injected between the S-shaped from said introduction path first continuous film and the second continuous film on a combination of the said fixed mold and said movable mold And a double-sided in-mold molding method. A double-sided in-mold molding method comprising a fixed continuous mold having a cavity for molding a molded product and a movable mold, wherein a first continuous film and a second continuous film having a printed layer formed on opposite surfaces are passed in parallel. In
Said fixed mold has a first curve which connects the sprue formed in the stationary mold,
The movable mold has a second curve connected to the cavity;
The stationary mold and the movable mold in a direction intersecting the S-shaped inlet channel having the first curve and the second curve from the inlet side of the sprue in order upon clamping the film feed direction Forming,
Said second fixed mold side, said one end of the first continuous film is disposed the first continuous film to come to a position facing the second curve, similar movable mold side, said second comprising the steps of one end of the continuous film is placed the second continuous film so as to face the first curve,
The step of molding the molded product of the resin is injected between the S-shaped from said introduction path first continuous film and the second continuous film on a combination of the said fixed mold and said movable mold And a double-sided in-mold molding method.

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